There is a limit to how much volume can be added before they stop looking natural and start looking artificially inflated. If they are very flat chested to begin with that limit is pretty small. Trans women don’t just go from flat to boobs over night, most of them take feminizing hormones for years before getting surgery if they even do get surgery. A lot of trans women are perfectly happy with the breasts they’re able to grow on the proper hormones so they just grow the same as anyone else’s breasts
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